, Volume 41, Issue 6, pp 928-933

A mechanism for photoinduced electronic reconstruction of the oxygen vacancy in doped quartz glass and its characteristics

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Abstract

A mechanism is proposed for electronic reconstruction of excited oxygen-deficient (OD) centers in doped quartz glass, associated with partial delocalization of one of the valence electrons. Using Falicov’s model Hamiltonian, the binding energy, radius, and criterion for an electron transition from a localized state to a state of intermediate radius are qualitatively determined. Densification of the glass matrix surrounding the OD centers is predicted as a possible consequence of the reconstruction of their valence electrons. An explanation is proposed for the irreversible photoinduced changes in refractive index, photoluminescence spectra, and electron paramagnetic resonance that are experimentally observed in doped quartz glasses after processing with large doses of ultraviolet light.

Fiz. Tverd. Tela (St. Petersburg) 41, 1019–1025 (June 1999)